I already have my cosplay idea, and I've already made a fair bit of progress:

I want to cosplay as the Ocarina of Time. That is to say, the musical instrument itself; if the instrument were anthropomorphized into a knight-like character. I realize motif will be super important to convey the idea, so I'm integrating the blue/silver color scheme, Ocarina shaped shoulder pads, arm bracers & shin guards based of the ocarina's mouthpiece, a spear with the Hylian crest and dangling musical staff scarf, and a small cape with the same music staff motif. I'm also thinking about giving the apron a N64 buttons design, but I'm not 100% sure yet. And of course I will be carrying around my own ocarina and playing it or not, depending on Con policy.